What is codd-neck bottle?

A Codd-neck bottle is a type of bottle used for carbonated beverages such as soft drinks and soda water. It was invented by Hiram Codd in 1872 and was widely used until the 1930s. It is a unique design that includes a glass marble that acts as a valve to prevent gas from escaping from the bottle. The bottle has a special neck design with a bulge in the middle where the glass marble sits, and a rubber or cork stopper is used to seal the bottle. To open the bottle, the stopper is pushed down, which releases the gas pressure and allows the marble to fall into a recess at the base, opening the bottle. Codd-neck bottles were popular because they were less likely to break than other bottles due to the thick glass design and proved difficult for tampering and refilling. Today, the bottles are considered collectors' items and are often used as a symbol of nostalgia for classic soft drinks.